The band brake of Figis used to control therotation of a drum. The weight of the handle is 2 lb. De-termine the minimum coefficient of friction between thebelt and drum for which the band brake is self-locking, thatis, for which no force on the handle is necessary to restrainarbitrarilv lare toraues on the drum.T.30 lb3, in.6 in -9 in.-18 in.

Draw the free-body diagram of the handle when the rotation of the drum is clockwise.

Answered: The band brake of Fig is used to…

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.85RP

See similar textbooks

Similar questions

The coeffient of static friction between the uniform bar AB of weight W and the ground is 0.45. Find the smallest angle and the corresponding force P that would initiate simultaneous tipping and sliding of the bar.
A 1.1-kg disk A is placed on the inclined surface. The coefficient of static friction between the disk and the surface is 0.35. Is the disk in equilibrium if P=5.5N and =30?
The two homogeneous bars AB and BC are connected with a pin at B and placed between rough vertical walls. If the coefficient of static friction between each bar and the wall is 0.25, determine the largest angle 6 for which the assembly will remain at rest.
The test specimen AB is placed in the grip of a tension-testing machine and secured with a wedge. The coefficient of static friction at both surfaces of the specimen is s. If the wedge angle is =18, determine the smallest s for which the grip is self-locking (no slipping takes place regardless of the magnitude of the force P). Neglect the weight of the wedge.
The single-threaded screw of the floor jack has a pitch of 0.5 in. and a mean radius of 1.75 in. The angle of static friction is 8.5. (a) Determine the couple C that must be applied to the screw to start lifting a weight of 4000 lb. (b) What is the couple required to start lowering the weight?
The uniform bars shown are joined by a frictionless pin at their tops. Thecoefficient of friction between the bars and the floor is 0.30. What is the value of θ whenmotion spends?
Determine the coefficient of static -friction force (µs) if ᴓs= 45?
A 4285 block is held in horizontal position as shown by a wedge at B. If the coefficient of friction between the block & the wedge is 0.25 and that between the wedge & the floor is 0.3, is the wedge self-locking?a. self-locking b. not self-locking c. cannot be determined
A safety device used by workers climbing ladders fixed to high structuresconsists of a rail attached to the ladder and asleeve that can slide on theflange of the rail. A chain connects the worker’s belt to the end of aneccentric cam that can be rotated about an axle attached to the sleeve at C.Determine the smallest allowable common value of the coefficient ofstatic friction between the flange of the rail, the pins at A and B, and theeccentric cam if the sleeve is not to slide down when the chain is pulledvertically downward.
The position of the automobile jack shown is controlled by a screw ABC that is single-threaded at each end (right-handed thread at A, left-handed thread at C ). Each thread has a pitch of 2.5 mm and a mean diameter of 9 mm. If the coefficient of static friction is 0.15, determine the magnitude of the couple M that must be applied to raise the automobile.
The vertical consists of a frame, three fixed 8-in.-diameter drums, and six small guide wheels with acombined weight of 50 lb. Determine the minimumweight W necessary to hold the trolley in equilibriumfor any position in its vertical guides. The coefficientof friction between the light cable and thedrums is 0.30. Draw a free body diagram
The square-threaded screw of the C-clamp has a mean diameter of 9 mm and a pitch of 1.5 mm. The coefficient of static friction between the threads is 0.2. If the torque M = 1.25 N · m is used to tighten the clamp, calculate (a) the clamping force; and (b) the torque required to loosen the clamp.

SEE MORE QUESTIONS

Recommended textbooks for you

International Edition---engineering Mechanics: St…

Mechanical Engineering

ISBN:

9781305501607

Author:

Andrew Pytel And Jaan Kiusalaas

Publisher:

CENGAGE L